Reinforcement is most likely to drive the evolution of
A. prezygotic isolating mechanisms because selection favors alleles that prevent hybridization.
B. postzygotic isolating mechanisms because selection acts after the formation of hybrids.
C. postzygotic isolating mechanisms because hybrids have low fitness relative to the parents.
D. prezygotic isolating mechanisms because selection favors alleles that promote hybridization.
Answer: A
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Fill in the blank(s) with the appropriate word(s).
Nuclear signaling is slowed down by CREB.
a. true b. false
What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
Which of the following statements about natural killer cells is TRUE?
a. NK cells recognize and destroy infected cells using a three-receptor system. b. NK cells exhibit memory after interacting with cells. c. NK cells use granzymes to kill their targets. d. NK cell number does not increase during recognition and destruction of infected cells.